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However, the relative atomic mass of each isotope is quite close to its mass number (always within 1%). The only isotope whose atomic mass is exactly a natural number is 12 C, which has a mass of 12 Da; because the dalton is defined as 1/12 of the mass of a free neutral carbon-12 atom in the ground state.
118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
This list of nuclides shows observed nuclides that either are stable or, if radioactive, have half-lives longer than one hour. This represents isotopes of the first 105 elements, except for elements 87 (), 102 and 104 (rutherfordium).
8 Out of 10 Cats Does Countdown is a British comedy panel show on Channel 4. The show follows the game of Countdown, but presented in a comedy panel show format seen on 8 Out of 10 Cats, with the show being a crossover of the two. The show is hosted by Jimmy Carr, with Rachel Riley and Susie Dent assuming their Countdown roles.
Phosgene is extremely poisonous and was used as a chemical weapon during World War I, where it was responsible for 85,000 deaths. It is a highly potent pulmonary irritant and quickly filled enemy trenches due to it being a heavy gas.
DC Universe Online (DCUO) is a free-to-play massively multiplayer online game [2] set in the fictional universe of DC Comics.Developed by Dimensional Ink Games and co-published by Daybreak Game Company and WB Games, the game was initially released in January 2011 for Windows and PlayStation 3.